Understand the Process. Reap the Benefits.

As a full-service fabrication shop, many of our projects include part design, fabrication, forming and laser welding before moving on to electropolishing. As the final step, electropolishing helps reduce weld discoloration and refine the surface, improving the overall performance of the completed component.

Ablefab 2 - Able Fab N Weld
Electropolishing Sample 1 - Able Fab N Weld

What is Electropolishing?

Electropolishing is a process that removes free iron from the surface of stainless steel components, which enhances corrosion resistance. Electropolishing makes stainless steel 30 times more corrosion-resistant than passivation alone.

Known as electromechanical metal finishing, electropolishing uses electric current and an electrolyte solution to remove microscopic imperfections.  Although the chemistry behind electropolishing is highly controlled, the overall process follows a series of straightforward steps.

  • Step 1

    Surface Preparation

    Each electropolishing project begins with proper surface preparation. Oils, machining fluids, shop contaminants and other surface residues are removed to help ensure consistent electrical contact during processing.

  • Step 2

    The Electropolishing Process

    Once the surface has been prepped, the component moves on to electropolishing. This is achieved by submerging the component in a temperature-controlled, high-viscosity solution of sulfuric and phosphoric acids and then connecting it to a direct-current power supply. As electric current passes through the solution, a microscopic layer is dissolved from the part's surface. This removes microscopic burrs and other surface imperfections while creating the smooth finish associated with electropolishing.

  • Step 3

    Surface Refinement

    As microscopic peaks are removed, the surface becomes smoother and the natural chromium-rich oxide layer becomes more uniform. The components are then cleaned to remove any remaining electrolyte before moving to final inspection. The result is a corrosion-resistant surface with fewer areas where contaminants or product residue can collect.

  • Step 4

    Rinsing & Quality Inspection

    Once removed from the cleansing bath, each component undergoes a final hand polish and inspection before shipment.

  • Step 1

    Surface Preparation

    Each electropolishing project begins with proper surface preparation. Oils, machining fluids, shop contaminants and other surface residues are removed to help ensure consistent electrical contact during processing.

  • Step 2

    The Electropolishing Process

    Once the surface has been prepped, the component moves on to electropolishing. This is achieved by submerging the component in a temperature-controlled, high-viscosity solution of sulfuric and phosphoric acids and then connecting it to a direct-current power supply. As electric current passes through the solution, a microscopic layer is dissolved from the part's surface. This removes microscopic burrs and other surface imperfections while creating the smooth finish associated with electropolishing.

  • Step 3

    Surface Refinement

    As microscopic peaks are removed, the surface becomes smoother and the natural chromium-rich oxide layer becomes more uniform. The components are then cleaned to remove any remaining electrolyte before moving to final inspection. The result is a corrosion-resistant surface with fewer areas where contaminants or product residue can collect.

  • Step 4

    Rinsing & Quality Inspection

    Once removed from the cleansing bath, each component undergoes a final hand polish and inspection before shipment.

Ablefab 21 - Able Fab N Weld

When Manufacturers Choose Electropolishing

Electropolished components are used in applications that require corrosion resistance and surface cleanliness. This process is commonly used throughout food processing, dairy, beverage production, wastewater treatment and other industries where clean, corrosion-resistant surfaces help support product performance and sanitation requirements.

Corrosion Resistance

One of the most common reasons an electropolishing finish is added is to improve corrosion resistance. The process creates a uniform surface that helps stainless steel perform in environments exposed to moisture, chemicals and frequent washdowns.

Sanitary Applications

Food processing, dairy, beverage production and other sanitary industries often use electropolished stainless steel components in their processes because smooth surfaces are easier to clean and maintain. Reducing microscopic surface irregularities also helps minimize locations where product residue or contaminants can collect.

Surface Finish

While electropolishing is more than a cosmetic process, appearance still matters. The process produces a clean and consistent surface across the entire component, without the directional polishing lines commonly associated with mechanical polishing.

Frequently Asked Questions

Yes. ABLE Fab n Weld capabilities include stainless steel fabrication, TIG & laser welding, metal forming and electropolishing. Our range of services keeps projects moving from fabrication through final finishing under one roof.

Mechanical polishing improves a surface through abrasion using belts, wheels or polishing compounds. Electropolishing uses an electrochemical process to remove microscopic surface imperfections, producing a smoother surface while improving corrosion resistance and cleanability.

Electropolishing is a superior form of passivation that provides enhanced shine and corrosion resistance. Both standard passivation and electropolishing improve the corrosion resistance of stainless steel, but in different ways. Standard passivation chemically enhances the existing protective oxide layer, while electropolishing removes a microscopic layer of material before strengthening that naturally occurring passive surface.

Yes. Electropolishing removes a controlled, microscopic layer of material from the part’s surface. Material removal is measured in thousandths or ten-thousandths of an inch, depending on the application and project requirements.

Yes. Electropolishing is commonly performed after fabrication and welding to improve the finished surface of stainless steel components. It is often used as the final manufacturing step before a component is placed into service.

Many grades of stainless steel can be electropolished, including common austenitic and ferritic alloys. The suitability depends on the material grade, part geometry and application requirements. Contact our team to learn more.

In many cases, yes. Because electropolishing is an electrochemical process rather than an abrasive one, it can produce a more uniform finish on intricate features or areas that may be difficult to reach with traditional mechanical polishing. Contact our team with your part geometry to determine whether electropolishing is appropriate for your application.

Electropolishing is part of the finished surface and does not wear off like a coating. However, the long-term performance of the component will still depend on its operating environment, maintenance and application.